Xiaomi Redmi Note 9 Pro is equipped with LED notification indicator, which signals missed calls, messages and other events. However, over time, this module may stop working due to software failures, mechanical damage or wear of contacts. In this article, we will discuss how to independently check the performance of the indicator without going to the service center.
It's important to understand that the LED on the Redmi Note 9 Pro is integrated into the top panel of the screen and is not a removable element, which means that replacing it requires disassembling the device, but before you bring the phone to the workshop, you should make sure that the problem is not the settings or temporary system failure.
We will look at both software diagnostic methods (through hidden menus and third-party applications) and hardware tests (contact check, flashlight illumination).
1. Checking notification settings: why the indicator may not burn
Before you sin on a hardware malfunction, make sure that the LED is not turned off at the system level. MIUI has separate settings for the indicator, which can be lost after updates or resets.
Go to Settings → Notifications → Light indicator. Here the switches should be active for:
- 📱 Missed calls (default color is red)
- 💬 Messages (blue or green, depending on the messenger)
- ⚠️ Other notifications (yellow or white)
If all options are turned on but the indicator doesn’t work, the problem is deeper.
Note the Do Not Disturb mode (Settings → Sound and Vibration → Do Not Disturb) When activated, the LED automatically turns off for all notifications except alarms, and check if specific apps (such as WhatsApp or Telegram) are added to the exclusion list.
⚠️ Attention: On some firmware MIUI (Especially custom) the light indicator option may be hidden. If the settings do not have the item "Light indicator", try resetting the notification settings to factory (Settings) → Annexes → Application management → ⋮ → Reset the notification settings).
2. Test mode: how to force the LED to turn on
The Redmi Note 9 Pro supports a hidden test mode that allows you to manually activate the indicator for verification, which works even if the settings do not have an LED control option.
Sequence of action:
- Open the Phone app and enter the combination: ##6484## (code for LED test).
- The screen will display a Manual LED Test menu with buttons to include red, green and blue.
- Turn to each color – the indicator should light up with the appropriate shade.
If the LED does not respond to any color, the problem is hardware.
Turn off the "Do Not Disturb" mode"|Charge your phone at least 30 times%|Make sure the screen is unlocked|Check in a dark room for better visibility-->
Alternatively, use MIUI Hidden Settings (available on Google Play), which has a Hardware Tests → LED Indicator section where you can run the test without entering the code, and requires ADB rights, but does not need root access.
⚠️ Note: If you enter the code ##6484## Nothing happens, your firmware can block the engineering menus. MTK Engineering Mode (for MediaTek processors) or Qualcomm Service Menu (for Snapdragon). 3. If standard methods have failed, install one of the specialized applications for testing hardware components, which allow you not only to check the LED, but also to identify other hidden problems.-3 apps for Redmi Note 9 Pro: 🔧 Phone Doctor Plus - comprehensive diagnostics, including LED and sensor tests. Free version is limited 1 day-test. 💡 LED Flashlight Test - focuses on indicators and flash, supports manual control of color and blinking frequency. 🛠️ TestM – a professional tool with root rights support. Shows the technical parameters of the LED (current, voltage). Instructions for Phone Doctor Plus: Install the application from Google Play. Run the Hardware test → LED Indicator. Follow the on-screen prompts (the app will ask you to confirm the blinking of different colors) and you will get a status report. PASS (works or FAIL (faulty). 💡If the application shows an error FAIL, But the LED sometimes flashes - the problem may be the firmware. Try to revert to the previous version. MIUI through settings → The phone. → Updating the system → ⋮ → Select the Service Pack Application Root LED Test Additional Phone Doctor Plus ❌ No. ✅ Yes, check sensors, battery, network LED Flashlight Test ❌ No. ✅ Yes (with manual tuning) TestM Camera Flash Test ⚠️ Partially. ✅ Yes (advanced) Shows technical parameters MIUI Hidden Settings ❌ No, I need you. ADB) ✅ Yes Access to hidden settings MIUI Hardware check: what to do if software methods do not help If the LED does not respond to either settings or test commands, the cause may lie in a physical malfunction: 🔌 Contact oxidation – moisture or dust could disrupt the connection between the motherboard and the indicator. 💥 LED burnout – due to a voltage surge or factory defect. 🛠️ Train damage - if you fall or disassemble sloppy. For initial diagnosis, follow the following steps: Check the heater (lightlight): Turn on the flashlight (Notification Panel) → Lights) and shine on the indicator area. If the LED is lighting up, the power driver is a problem. Check the case: In bright light, check if there are cracks or bloating at the top of the screen (where the light is located). If you hear a knock inside or a small particle rolling over, it's a sign of the contact detachment. 9 Pro? LED module is a chip size ~2×1 It's soldered into the top of the motherboard next to the display connector, and it's covered in a transparent compound that can become cloudy over time, leading to a dim glow. The image below (from the service manual) shows its location: [this would be a photo, but in text format it is not] For a deep check, you will need to disassemble the phone. On the Redmi Note 9 Pro, the LED is soldered to the board and does not have a separate connector, so replacing it requires soldering. If you are not sure about your skills, it is better to contact the service. The average cost of replacing the indicator in 2026 is from 800 to 1500 rubles (depending on the region). 5. Many owners of Redmi Note 9 Pro mistakenly take the following situations for the breakdown of the indicator: 📵 Disabled notifications for a specific application, for example, WhatsApp needs to separately allow light display in chat settings. 🌓 Adaptive backlighting: In some firmwares, the indicator automatically turns off when illuminated high (light sensor is triggered). 🔄 Conflict of topics of design. Topics from MIUI Themes can redefine the color of the indicator under the wallpaper background, making it invisible. To rule out these factors: Check the notification settings for each messenger separately. Turn off adaptive brightness in Settings → Display. → Adaptive brightness. Return the standard design theme (Settings) → Theme → Standard). 💡If the indicator works only for calls, but not for messages, the problem is in the notification sync settings. → Annexes → Permit management → Notification 6: When to contact the service: signs of serious breakdown If after all the checks the LED remains inoperable, and errors such as errors appear in the test menus LED Test Failed or Hardware Error, which indicates a hardware malfunction: ⚡ The indicator does not respond to any color in the test mode. 🔥 The phone overheats at the top of the body (may indicate a short circuit in the LED circuit). 📉 Decline in productivity after falling or getting moisture. 🛑 Mistake. E:LED_IC in the engineering menu (testifies to damage to the driver chip). Cost of repair in the official Xiaomi service: Repair type Cost (₽) Time (days) Diagnostics 0–500 0.5–1 LED replacement (with soldering) 1200–2000 1–3 Repair of contacts (cleaning/sweeping) 800–1500 1–2 Replacement of the display plume (if damaged) 2500–3500 2–5 Important: Some unofficial services offer a "quick replacement" of LED for a "fast replacement" 500–700 Most often, this means that you will simply turn off the check of the indicator in the firmware, and physically it will remain unworkable. 6 months and a check with a list of works performed. FAQ: Frequent questions about the Redmi Note light indicator 9 Pro 🔹 Can you replace the LED yourself? Theoretically, yes, but in practice, it requires soldering experience. SMD-LED on the Redmi Note 9 Pro soldered to the fee (size) ~1×1 And you need a soldering dryer, flux, and a magnifier to replace it, and without skill, you risk damaging the surrounding elements (like a microphone or a proximity sensor). If you do, here's a step-by-step instruction: Disassemble the phone (need a pickup and a screwdriver). T3). Disconnect the battery plume. Find the LED on the board (near the display connector, marked as LED1). Heat contacts with a hair dryer (temperature) ~300°C) and remove the old LED. Set a new one (nominal: 0603 SMD LED, 20mA) and sell the contacts. 🔹 Why does the light flash green when the phone is charging? MIUI. Green indicates the charging process and red indicates the low battery level. If the indicator flashes green when the phone is off, it means that the battery is charged in emergency mode (for example, after a deep discharge). → Battery and productivity → Battery settings. Turn off Charging Indicator. 🔹 Can a virus turn off the LED? Theoretically, yes, if a virus has acquired root rights or has replaced system files. In practice, these are extremely rare. More often, the virus is an aggressive application (for example, a memory cleaner) that blocks notifications at the Android level, to check: Launch your phone in Safe Mode (press the power button) → Safe Mode. If the indicator is running, the problem is in third-party software. Check the list of applications with rights ADB or root through AppOps (you need to enable Settings) → For developers → Inactive applications). 🔹 Why does the indicator burn all the time, even when there are no notifications? This is a typical symptom of sticking contacts or failure in the LED driver. Causes: Moisture getting under the body (the indicator can burn dull white), damage to the plume after a fall, firmware failure (especially after informal updates). Solutions: Dry your phone in rice or silica gel on 24 Reset the settings to factory settings (Settings) → The phone. → If it doesn't work, bring it to the service (you need a diagnostic fee). 🔹 How to turn on the indicator on custom firmware (for example, LineageOS)? On most custom firmware, the LED is controlled through a file /sys/class/leds/red/brightness. To turn it on: echo 255 | su -c "tee /sys/class/leds/red/brightness" To automatically work, install a Magisk module called LED Controller or edit the file /vendor/build.prop, line: persist.sys.led_battery_enabled=1 After the changes, restart the phone.